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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Structural Engineering and Mechanics
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Volume & Issues
Volume 10, Issue 6 - Dec 2000
Volume 10, Issue 5 - Nov 2000
Volume 10, Issue 4 - Oct 2000
Volume 10, Issue 3 - Sep 2000
Volume 10, Issue 2 - Aug 2000
Volume 10, Issue 1 - Jul 2000
Volume 9, Issue 6 - Jun 2000
Volume 9, Issue 5 - May 2000
Volume 9, Issue 4 - Apr 2000
Volume 9, Issue 3 - Mar 2000
Volume 9, Issue 2 - Feb 2000
Volume 9, Issue 1 - Jan 2000
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Dynamic nonlinear member failure propagation in truss structures
Malla, Ramesh B. ; Nalluri, Butchi B. ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 111~126
DOI : 10.12989/sem.2000.9.2.111
Truss type structures are attractive to a variety of engineering applications on earth as well as in space due to their high stiffness to mass ratios and ease of construction and fabrication. During the service life, an individual member of a truss structure may lose load carrying capacity due to many reasons, which may lead to collapse of the structure. An analytical and computational procedure has been developed to study the response of truss structures subject to member failure under static and dynamic loadings. Emphasis is given to the dynamic effects of member failure and the propagation of local damage to other parts of the structure. The methodology developed is based on nonlinear finite element analysis technique and considers elasto-plastic material nonlinearity, postbuckling of members, and large deformation geometric nonlinearity. The pseudo force approach is used to represent the member failure. Results obtained for a planar nine-bay indeterminate truss undergoing sequential member failure show that failure of one member can initiate failure of several members in the structure.
Plate on non-homogeneous elastic half-space analysed by FEM
Wang, Yuanhan ; Ni, Jun ; Cheung, Y.K. ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 127~139
DOI : 10.12989/sem.2000.9.2.127
The isoparametric element method is used for a plate on non-homogenous foundation. The surface displacement due to a point force acting on the non-homogeneous foundation is the fundamental solution. Based on this analysis, the interaction between the foundation and plate can be determined and the reaction of the foundation can be treated as the external force to the plate. Therefore, only the plate needs to be divided into some elements. The method presented in this paper can be used in cases such as thin or thick plate, different plate shapes, various loading, homogenous and non-homogenous foundations. The examples in this paper show that this method is versatile, efficient and highly accurate.
A practical coherency model for spatially varying ground motions
Yang, Qing-Shan ; Chen, Ying-Jun ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 141~152
DOI : 10.12989/sem.2000.9.2.141
Based on the discussion about some empirical coherency models resulted from earthquake-induced ground motion recordings at the SMART-1 array in Taiwan, and a heuristic model of the coherency function from elementary notions of stationary random process theory and a few simplifying assumptions regarding the propagation of seismic waves, a practical coherency model for spatially varying ground motions, which can be applied in aseismic analysis and design, is proposed, and the regressive coefficients are obtained using least-square fitting technique from the above recordings.
Formulation and evaluation of incompatible but convergent rational quadrilateral membrane elements
Batoz, J.L. ; Hammadi, F. ; Zheng, C. ; Zhong, W. ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 153~168
DOI : 10.12989/sem.2000.9.2.153
This paper presents four incompatible but convergent Rational quadrilateral elements, two four-node elements (RQ4Z and RQ4B) and two five-node elements (RQ5Z and RQ5B). The difference between the so-called Rational Finite Element (Zhong and Zeng 1996) and the Free Formulation (Bergan and Nygard 1984) are discussed and compared. The importance of the mode completeness in these formulations is emphasized. Numerical results for several benchmark problems show the good performance of these elements. The two five-nodes elements RQ5Z and RQ5B, which can be viewed as complete quadratic mode elements (with seven stress modes), always give better results than the four nodes elements RQ4Z and RQ4B.
Optimum design of parabolic steel box arches
Azad, Abul K. ; Mohdaly, Hani M.M. ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 169~180
DOI : 10.12989/sem.2000.9.2.169
An optimization procedure has been prescribed for the minimum weight design of symmetrical parabolic arches subjected to arbitrary loading. The cross section is assumed to be a symmetrical box section with variable depth and flange areas. The webs are unstiffened and have constant thickness. The proposed sequential, iterative search technique determines the optimum geometrical configuration of the parabolic arch which includes the optimum depth profile and the optimum lengths and areas of the required flange plates corresponding to the prescribed number of curtailments. The study shows that the optimum value of rise to span ratio (h/L) of a parabolic arch is maximum at 0.41 for uniformly distributed loading over the entire span. For any other loading, the optimum value of h/L is less than 0.41.
Damage assessment of linear structures by a static approach, I: Theory and formulation
Tseng, Shih-Shong ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 181~193
DOI : 10.12989/sem.2000.9.2.181
The objective of this research is to propose a new global damage detection parameter, termed as the static defect energy (SDE). This candidate parameter possesses the ability to detect, locate and quantify structural damage. To have a full understanding about this parameter and its applications, the scope of work can be divided into several tasks: theory and formulation, numerical simulation studies, experimental verification and feasibility studies. This paper only deals with the first part of the task. Brief introduction will be given to the dynamic defect energy (DDE) after systematically reviewing the previous works. Process of applying the perturbation method to the oscillatory system to obtain a static expression will be followed. Two implementation methods can be used to obtain SDE equations and the diagrams. Both results are equally good for damage detection.
Damage assessment of linear structures by a static approach, II: Numerical simulation studies
Tseng, Shih-Shong ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 195~208
DOI : 10.12989/sem.2000.9.2.195
To confirm the theory and static defect energy (SDE) equations proposed in the first part, extensive numerical simulation studies are performed in this portion. Stiffness method is applied to calculate the components of the stresses and strains from which the energy components and finally, the SDE are obtained. Examples are designed to cover almost all kinds of possibilities. Variables include structural type, material, cross-section, support constraint, loading type, magnitude and position. The SDE diagram is unique in the way of presenting damage information: two different energy constants are separated by a sharp vertical drop right at the damage location. Simulation results are successfully implemented for both methods in all the cases.
General nonlocal solution of the elastic half space loaded by a concentrated force P perpendicular to the boundary
Artan, R. ;
Structural Engineering and Mechanics, volume 9, issue 2, 2000, Pages 209~214
DOI : 10.12989/sem.2000.9.2.209
The main purpose of this paper is to develop the results introduced in Artan (1996) and to find a general nonlocal linear elastic solution for Boussinesq problem. The general nonlocal solution given Artan (1996) is valid only when the distance to the boundary is greater than one atomic measure. The nonlocal stress field presented in this paper is valid for the whole half plane.